js to implement web calculator

How to make a simple web calculator using HTML, CSS and JS?

A computer has:

Computer overall frame
Input box
Input button

Computer overall frame:

/*Set div style*/
 #showdiv{
   border: solid 1px;
   border-radius: 5px;
   width: 350px;
   height: 400px;
   text-align: center;
   margin: auto;/*Set center*/
   margin-top: 50x;
   background-color: rgb(214, 219, 190);    
}

Input box:

/*Set the input box style*/
  input[type=text]{
      margin-top: 20px;
      width: 290px;
      height: 40px;
      font-size: 20px;

}

Input Button:

/*Set button style*/
   input[type=button]{
      width: 60px;
      height: 60px;
      margin-top: 20px;
      margin-left: 5px;
      margin-right: 5px;
      font-size: 30px;
      font-weight: bold;
      font-family: "楷书";
}

Use js code to perform corresponding business logic operations:

<!--Declare js code-->
        <script>
            function test(btn){
                //Get the button object var number = btn.value;
                //Execute the corresponding business logic switch (number) {
                    case "=":
                        document.getElementById("input").value = eval(document.getElementById("input").value);
                        break;
                    case "c":
                        document.getElementById("input").value="";
                        break;
                    default:
                        //Assign the value of the button to the input box document.getElementById("input").value+=number;
                        break;
                }
                
            }
</script>

Using HTML for computer typesetting:

<body>
    <div id="showdiv">
        <input type="text" id="input" readonly="readonly"><br>
        <input type="button" value="1" onclick="test(this)">
        <input type="button" value="2" onclick="test(this)">
        <input type="button" value="3" onclick="test(this)">
        <input type="button" value="4" onclick="test(this)"><br>
        <input type="button" value="5" onclick="test(this)">
        <input type="button" value="6" onclick="test(this)">
        <input type="button" value="7" onclick="test(this)">
        <input type="button" value="8" onclick="test(this)"><br>
        <input type="button" value="9" onclick="test(this)">
        <input type="button" value="+" onclick="test(this)">
        <input type="button" value="-" onclick="test(this)">
        <input type="button" value="*" onclick="test(this)"><br>
        <input type="button" value="0" onclick="test(this)">
        <input type="button" value="/" onclick="test(this)">
        <input type="button" value="c" onclick="test(this)">
        <input type="button" value="=" onclick="test(this)">
      


    </div>
</body>

Overall code:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        /*Set div style*/
        #showdiv{
            border: solid 1px;
            border-radius: 5px;
            width: 350px;
            height: 400px;
            text-align: center;
            margin: auto;/*Set center*/
            margin-top: 50x;
            background-color: rgb(214, 219, 190);    
         }
        /*Set the input box style*/
        input[type=text]{
            margin-top: 20px;
            width: 290px;
            height: 40px;
            font-size: 20px;

        }
        /*Set button style*/
        input[type=button]{
            width: 60px;
            height: 60px;
            margin-top: 20px;
            margin-left: 5px;
            margin-right: 5px;
            font-size: 30px;
            font-weight: bold;
            font-family: "楷书";
        }
        </style>
        <!--Declare js code-->
        <script>
            function test(btn){
                //Get the button object var number = btn.value;
                //Execute the corresponding business logic switch (number) {
                    case "=":
                        document.getElementById("input").value = eval(document.getElementById("input").value);
                        break;
                    case "c":
                        document.getElementById("input").value="";
                        break;
                    default:
                        //Assign the value of the button to the input box document.getElementById("input").value+=number;
                        break;
                }
                
            }
        </script>
        
        
    <title>Document</title>
</head>
<body>
    <div id="showdiv">
        <input type="text" id="input" readonly="readonly"><br>
        <input type="button" value="1" onclick="test(this)">
        <input type="button" value="2" onclick="test(this)">
        <input type="button" value="3" onclick="test(this)">
        <input type="button" value="4" onclick="test(this)"><br>
        <input type="button" value="5" onclick="test(this)">
        <input type="button" value="6" onclick="test(this)">
        <input type="button" value="7" onclick="test(this)">
        <input type="button" value="8" onclick="test(this)"><br>
        <input type="button" value="9" onclick="test(this)">
        <input type="button" value="+" onclick="test(this)">
        <input type="button" value="-" onclick="test(this)">
        <input type="button" value="*" onclick="test(this)"><br>
        <input type="button" value="0" onclick="test(this)">
        <input type="button" value="/" onclick="test(this)">
        <input type="button" value="c" onclick="test(this)">
        <input type="button" value="=" onclick="test(this)">
      


    </div>
</body>
</html>

Result:

You must have learned how to make front-end web computers!

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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